1 © 2013 Generation mPower, LLC. All rights reserved.

This material is based upon work supported by the Department of Energy under Award Number DE-NE0000583.

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United Sta tes Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal l iability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not

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B&W mPower™ Program IAEA SMR Technical Meeting

Robert Temple Chengdu, China

September 3, 2013

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Outline

• Introduction

• Plant Layout

• Integral Reactor Design

• Safety Features

• Technology Development

• Lead Plant Deployment

• Conclusion

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mPower Goal and Value Proposition

Develop and deploy, by 2022, an SMR that offers:

Lower capital cost

Schedule & cost certainty

Competitive LCOE pricing

within the constraints of:

• Proven: GEN III+, complies with established NRC regulation

• Safe: Robust margins, passive safety

• Practical: Standard fuel, construction and operations & maintenance

• Benign: Underground, small footprint

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Generation mPower Industry Consortium

Nebraska Electric G&T Cooperative

The Industry Consortium is dedicated to addressing and influencing the proper regulatory framework, design requirements and licensing infrastructure necessary to support the construction of a practical SMR plant featuring the B&W mPower™ reactor. The 15 member consortium benefits the utility members by providing them a mechanism to promote and define a viable SMR option for their future power generation portfolios. The consortium benefits Generation mPower by providing the company with expert focused, operational and user-community input to the B&W mPower reactor design and licensing processes.

Generation mPower Industry Advisory Council

• Duke Energy • Entergy • Exelon • JEA

• American Electric Power • Bruce Power • Dayton Power & Light • Dominion

• MidAmerican Energy • Nebraska Public Power District • Ontario Power Generation • SaskPower

The Industry Advisory Council (IAC) is a group of 27 utilities that provides Generation mPower with expert review and feedback regarding B&W mPower reactor licensing and design activities. Membership includes all consortium members above plus these utilities:

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High-Level Requirements

Primary Conditions 2060 psia 606°F Core outlet 31 Mlbm/hr

Secondary Conditions

Steam 571oF @ 825 psia) 50oF Superheat (BOL)

Feedwater 414oF 2.12 Mlbm/hr

• 180 MWe nominal output per module

• 60-year plant life

• NSSS forging diameter allows:

Greater sourcing options

Rail shipment

• Standard fuel (<5% 235U)

• Long fuel cycle, 4-year core life

• Long-term coping time without off-site support

• Minimize emergency planning zone

• Spent fuel storage on site

• Conventional/off-the-shelf balance of plant systems

• Accommodate air-cooled or water-cooled

condensers

• Flexible grid interface (50 hz or 60 hz)

• Digital I&C compliant with NRC regulations

• Power maneuvering

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Generation mPower 2-Pack Plant

mPower Plant Area 1500 feet x 1000 feet (457 meters x 305 meters) ~36 acres within outer fence (~14.6 hectares)

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Generation mPower 2-Pack Plant

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Integral Reactor

• Simplified – integrated, pressurized water reactor

• No RCS large bore external piping

• Internal control rod drive mechanisms

• Internal RCP impellers – external canned motors

• Control rods versus boron shim for reactivity control

• Load following capability

• Passive safety

Emergency diesel generator power not required

Core remains covered during small break LOCA accident

• Performance of critical functions by multiple systems for improved

reliability and plant safety

• Multiple module plants – BOP equipment not shared

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B&W mPower Integral Reactor

Integral reactor has key features of conventional PWR

Main Steam Outlet Feedwater Inlet

Pressurizer

Reactor Coolant Pumps

Steam Generator

Riser

Mid Flange

Control Rod Drive Mechanism

Upper Reactor Vessel Internals

Control Rod Guide Frame

Core Barrel

Core

Reactor Vessel

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• Low Core Linear Heat Rate

Low power density reduces fuel and clad temperatures

during accidents

Low power density allows lower flow velocities that minimize

flow induced vibration effects

• Large Reactor Coolant System Volume

Large RCS volume allows more time for safety system

response in the event of an accident

More coolant is available during a small break LOCA

providing continuous cooling to protect the core

• Small Penetrations at High Elevation

High penetration locations increase the amount of coolant

left in the vessel after a small break LOCA

Small penetrations reduce rate of energy release to

containment resulting in lower containment pressures

Inherent Safety Features

CONFIDENTIAL AND PROPRIETARY TO B&W

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Safety System Strategy

• Highly Reliable Systems

Passive auxiliary steam condenser (CNX)

High and low pressure decay heat removal (RCI)

• Emergency Core Cooling System (ECC)

Automatic RCS depressurization

Intermediate pressure injection

Reactor inventory replenishment

Passive containment cooling

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Unique “Defense in Depth” Design

• Diverse, non-safety systems provide first defense beyond normal operation

• Design eliminates many traditional Design Basis Events and postulated accidents

• Simple, passive safety protection against low probability and beyond-design-basis events

• Other features protect reactor and containment for “non-credible” events

Loss of Feedwater (10-1) Station Blackout (10-4)

ECC = Emergency Core Cooling System RCI = Reactor Coolant Inventory & Purification CNX = Auxiliary Condenser

Total core damage frequency below all current licensed reactor designs

Design prevents core uncovery during design basis events

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Safety Performance

Safety is enhanced by integrated

design features and defense in depth

Core Damage Frequency Target (per reactor year)

Worst Break Location

SBO Coping Time

Emergency Zone 1 REM at 1,000 Feet

25 REM at 25 Miles

7 Days 14 Days

~ 5 Feet above core

~75 feet above core

10 -4 – 10 -5

10 -8

8 Hours

10 -7

Traditional PWR AP 1000 B&W mPower

~ 5 Feet above core

25 REM at 25 Miles

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Balance of Plant

• Plant designed to produce a nominal

180 MWe

• Conventional steam cycle equipment

(small, easy to maintain and replace)

• BOP operation not credited for design

basis accidents

Conventional

Air-Cooled Condenser

Steam Cycle

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Turbine Cycle

Integrated Control Rod Driveline Test Program

Static Test Facility (STF)

Cold Flow Test Loop (CFTL)

CRDM Internal Electrical Connector

Test Program

CRDM Electrical Feedthrough Test Program

Fuel Mechanical Test Program

Reactor Coolant

Pump Test Program

Vessel Model Flow Test Program

B&W mPower Test Program Overview

Integrated Component and

System Test Programs

Integrated Systems Test (IST) Facility

Critical Heat Flux (CHF) Testing

Hot Flow Test Loop (HFTL)

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IST Objectives

• Integrated system performance

• Steam generator and component performance

• Evaluation model development support

• Licensing support

• Insights

Control and protection systems development

Design enhancements

Simulator development

Operating procedures and training development

• Demonstration to potential customers

A broad spectrum of objectives identified

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IST Features

Scaling

• Full Height

• Full Pressure and Temperature

• Power, Area and Volume

Scaled

• Real Time Operation

• Trace Heating

Systems Simulated

• Integral Reactor Coolant

• Steam and Feedwater

• Reactor Coolant inventory and

purification

• Emergency Core Cooling

• Component Cooling Water

• Protection and Control

Integral reactor and important systems carefully designed

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Current IST Status

• Unit operated up to 120% thermal power

• Solved a number of power escalation technical

problems

Pressurizer pressure control

Main feed water system performance

Main Steam condenser control

Steam generator – heat sink coupling

• Instrumentation validity established

• Completed low power steam generator tests for

information

• Installed ECCS mods to replicate mPower

• Completed natural circulation, reactor trip and natural

circulation cool down testing

• Overheating transient testing in progress

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TVA / Clinch River

• November 20, 2012 – B&W and TVA announce contract to prepare and support NRC review of CPA for B&W mPower™ SMR at TVA's Clinch River Site in Oak Ridge, TN

Formalizes first steps toward anticipated B&W mPower deployment at Clinch River, as contemplated in TVA's May 2011 Letter of Intent to B&W for the project

Represents first definitive milestone in DOE’s recently initiated SMR Licensing Technical Support Program for commercial demonstration of SMRs by 2022

DOE selected B&W mPower in November 2012 as recipient of Program's competitively bid cost-share funding grant

• Work at the Clinch River site is well under way

• Contract defines respective responsibilities and work scopes for TVA and B&W to:

Conduct Clinch River Site geological characterization

Develop a Preliminary Safety Analysis Report, and

Prepare an Environmental Assessment for deploying up to four mPower SMR reactors

• TVA currently expects to submit CPA to NRC in 2015 Subsurface Investigation

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First Unit Deployment Integrated Part 50/52 Lead Plant Deployment Schedule

Key Cooperative Agreement Milestones

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Conclusion

• Generation mPower brings together the alliance of B&W and Bechtel to

design and construct turnkey mPower SMR plants

• The B&W mPower modular reactor plant has a unique integral reactor

design and passive safety system

• Design and licensing activities are well underway. DCD submittal 3Q 2014

• A comprehensive technology validation program is in process

• Clinch River Site characterization underway

• In active discussions with several customers for international deployment

of mPower plants